Weighing conveyer



INVENTOR. ag? if TITORNEY.

C. S. WEYANDT WEIGHING CONVEYER Jan. 25, 1944.

2 Sheets-Sheet l Filed Oct. 24', 1940 0 CarZSVl BY {m 2/ Jan. 25, 1944 c. s. WEYANDT WEIGHING CONVEYER Filed Oct. 24, 1940 2 Sheets-Sheet? id mmkv nuan'o'onn'uuo INVENTOR. BY CarZ ,5. W azzdf' ORNEY.

Patented Jan. 25, 1944 2,340,030

UNITED STATES PATENT OFFICE 2,340,030 wmonme comma Carl S. Weyandt, Homer City, Pa. Application October 24, 1940, Serial No. 362,500 6 Claims. ('01. 198-37) The present invention relates to weighing ma- Referring to the drawings, there is shown a chines for continuously weighing materials, and frame I which may be constructed of channel in particular is an improvement on the apparatus iron, and a hopper 2 is supported therefrom by exemplified by my co-pending application for cables 3 passing through eye bolts 4 on the hopper Weighing and feeding device, Serial No. 148,070, 5 and having their ends secured to the frame by filed June 14, 1937. suitable clamps 5 and 6. The open mouth of the In the apparatus as disclosed in said applicahopper terminates adjacent a conveyer I which tion, which comprises an electrical-1y operated vi-'. preferably is of the vibratory type operated by a bratory conveyer that feeds material to a consuitable vibratory motor, for example, as dis tinuously moving belt conveyer mounted on a closed in Patent No. 2,187 717 issued to me on as the belt conveyer so that the driving torque l5 adjustment Wis provided for swinging the hopper the sensitivity of the scale.

It It an object of my invention to provide a with frame I, if desired is located adjacent frame weighing machine having an improved sensitivity l, and a scale, designated generally at I2, is suitof control. ably mounted on the top thereof This scale A further object is the provision of a feeder mamay be of any suitable type or construction and chine which will feed bulk material at a predeas shown has a weight pan l3 and a load pan M te ined rate within fine limits of accuracy on opposite sides of the scale pivot Two straps pieferably employ a torque bar pivotally coned to be clamped in adiusted position by a clampnectecl at a fixed point adJacent the motor and mg bolt 21 passing through a slot 28 therein A to a point on the scale to allow weighing or confine adjustment of the telescoping members is Where control means is employed, it may be sub- -ries a roller or drum 33. An endless belt 34 passes stantially that,of my co-pending application, or over rollers 24 and 33, and it will be apparent that I may employ any other suitable type of control the tension of belt 34 may be adjusted by adjustmeans to control the feed to the scale conveyer. merit of the telescoping members 25 and 26. A

The invention will be described in greater deconstant speed motor 36, which may be of the tail in the foll win Specification taken in consynchronous type, is suitably secured to the frame nection with the accompanying drawings which H and carries a driving sprocket 37 on the shaft illustrate a preferred embodiment of the inventhereof. The roller shaft 32 carries a sprocket tion by way of example, and wherein: wheel 38 and an endless chain 39 passing over the Figure l is a side elevation partly diagramsprocket wheels 31 and 38 drives the conveyer belt matic of a preferred embodiment of the invention, 34 from the motor 36. I

Figure 2 is an end view of Figure 1, The vibratory conveyer 7 supplies material to Figure 3 is an enlarged view of a detail, the scale conveyer, but any other means or ar- Figure 4 is a fragmentary end view of Figure 3, rangement may be provided to supply material Figure 5 is a wiring diagram, and to the scale conveyer, such as a bin, hopper, belt Figure 6 is a diagrammatic view of a detail. conveyer or the like. The rate of feed of vibrav equidistant parallel therewith, and by lead wires tory conveyer 1 may be controlled by varying the urrent supply thereto or an arrangement may be provided controlled by the state of balance of the scale, as disclosed in said co-pending application which is here briefly described. Refer-ring to Figure 5, a switch operating bar 5| is aec'w'fid. to one side of the scale beam in any suitable manner and carries the contact screws 52 and 53 which are preferably substantially from the center knife edge bearing and are located as near thereto as practicable. However, if desired, the scale indicator may be employed to control or operate the switches. Also, any suitable type of switch or contact may be employed, the preferred type herein diagrammatically illustrated being of the vacuum type.

Switch 55, shown schematically in Figure 5, comprises a vacuum cylinder 50 permanently closed at one end and closed at the other end by a diaphragm 58 to which is secured in gas tight relation a movable switch operating arm 59. The arm 59 has a contact element ti at one end which extends to the fixed contact or lead 62 secured to the back fixed wall of the switch cylinder. A spring 63 is fixedly secured at one end and at its other end carries a hook 54 and a second spring Eli is secured to the same support as the spring 03 and has its free rounded end bearing against arm 59 so that the arm normally is held in contact with the hook 64. In unbalanced position the contact screw 52 bears against the spring 03 and upon downward movement of the scale beam on the left the contact arm 59 will break contact with lead 02. For convenience of reference the other limit switch is given the numeral lid and its contact arm is designated by the numeral {59 operated by hook ii and springs 12 and 13, and the lead thereof is designated by the numeral M. In balanced position there is no contact between the adjusting screws 52 and 53 and the springs 03 and i2.

The electrical control system, excluding the limit switches 55 and just described are mounted on a panel enclosed in a suitable control box carried on the same frame. Two thermionic valves 30 and 8| are employed as rectifiers, the filaments 03 and 84 of which are heated from the secondary coils B and 86 of transformer 81, which obtains its power from any suitable alternating current source connected to wires 08 and 90. The thermionic valves 80 and 8| have anodes 9i and 92 respectively. from the alternating current source passes from wire 90 through lead 93 and switch 94 to lead 95, and from thence through the coil 96 of the hopper vibrator 9 and hopper vibrator motor rheostat 91 to the cathode 84, thence to anode 92 and by wire 98 to wire 88. The other half wave passes from wire 88, by lead 98 to the oathode 83 thence to anode 9i and to the normal feed rh'eostat IOI and vernierrheostat I02 in I03 and I04 to the terminal 62 of'the overfeed switch 55 and thence, when switch 55 is closed; and switch 50 open, through switch arm 59 and lead wires I05 and I06 to the coil I01 of the vibratory conveyer motor, and thence by lead 95, switch 94 and lead 93 to the wire 90. When the scale is in balanced position, switch 55 is closed and switch, 58 is open and switch 55 remains closed when the scale is balanced and when the feed is too slow.

The normal teed rheostat IM and normal feed Vernier I02 are also connected by wires I03 and I00 to terminal IIO of switch H2.

of the switch H2 is connected by wire II4 to overfeed resistor II5, which is connected by lead wire III to common return wire I00. when switches 55 and H2 are closed the resistance of switch 55 is low enough so that no appreciable current flows across terminals H0, H3 of switch "2, but when switch 55 is opened the resistance H5 is thrown into series. connection with the normal and vernler rheostats IOI, I02 and cuts down the current supplied to the motor I01 through the path provided by normal feed rheostat IN and vernier rheostat I02 and by wires I03 and I09 to switch H2 and thence across the terminals H0, H3 to resistor H5, and thence by wire IIG to common return I00.

The underieed rheostat I20 is connected by wire I2I to terminal I22 of switch H2. The I20 is connected by wire I24 to switch element 14 oi switch 68, and when switch is completed through switch rod 69 to the common return I00. Thus, it will be seen overfeed resistor H5 is in series with the normal feed resistor when switch 55 is open, and is not effective when switch 55 is closed, while underfeed resistor H0 is in parallel with the normal feed resistor when switch 68 is closed, but is not eflective when switch 00 is open. Resistor I20 preferably is very high relative to normal feed resistor IOI, and resistor H5 preferably is very low relative to normal feed resistor l0I. This arrangement cuts down the current su ply to the motor I01 when the overfeed resistor H5 is cut in, and increases the current when underieed resistor I20 is cut in. The belt conveyer motor 35 is connected by lead wire I26 to the one alternating current supply wire 00, and by wire I21, switch I28 and wires I29 and 93 to the other alternating current supply wire 90.

To start the operation of the feeder the switch I28 is closed to supply alternating current to the belt conveyer motor 36 which drives the belt conveyer 34 mounted on one pan of the scale. Sufficient weights now are added to the load pan I3 to partly counterbalance the weight of the left scale pan. The switch 94 is now moved to closed position. This energizes the One half wave hopper vibrator motor and the conveyer motor H01 and causes material to be moved along the conveyer 1 and onto the continuously moving belt conveyer 34, the hopper vibrator 9 preventing the material from clogging the hopper. While the material is thus being fed onto the uniformly moving belt conveyer 34, the normal feed rheostats IN and I02 are manually adjusted to vary the discharge of material from conveyer i onto the conveyer 34 at the desired or predetermined rate so as to bring the scale into substantial balance.

The s 'tch H2 is now turned to closed position for automatic operation. In closed position of the switch II2 with the scale balanced, switch 55 is closed and switch 68 is open. An underieed of material causes the switch elements 59 and 14 to contact while switch 55 remains closed and thus resistor I20 is placed in parallel with resistors IM and I02 whereby an increased current is supplied to the motor coil I01 which speeds up the feed from the conveyer 1 until the point of balance is reached. When balance is reached, contacts 59, 14 are opened, while switch 55 remains closed to thereby restore the normal feed current. If an overfeed occurs the left side moves down, thereby opening switch 55 while switch 50 remains open, which places overfeed resistor II5 I veyer suspension straps apparent that the load pan moves up or down a trol movement of the scale.

ed on pivots l3! (Figure 6) l5, l6 and the pan M on its pivots and thus would interfere with the accuracy of the scale control.

In carrying out the pres carries an L M6 with a clevis NH si lock nuts M2 and a and lies the same radial distance from shaft 23 as the lowermost point of sprocket pending on the The torque her being in substantially the same plane as the bottom of the driving chain prevents any twisting movement of the conveyer due to the motor driving a belt oonveyer carried on Q. means controlled by movement or said scale for feeding material thereto said belt scale movement.

4. A weighing machine comprising scale, a conveyer frame pivotally suspended from the scale, a continuously operating belt merits of said scale.

5. A weighing machine com prising s scale, at frame mounted on said scale and supported CARL B. -WEYANU1. 

